Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['d', 'G', '5047', 'X', 'Z', '2085', 'l', 'u']

4, 7, 5047, 24, 26, 2085, 12, 21